Process Equipment and Plant Design
Overall tray efficiency of a distillation column is the ratio of the number of

Real trays required to the number of ideal trays required
Overall gas transfer units to the number of ideal trays required
Ideal trays required to the number of real trays required
None of these

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Process Equipment and Plant Design
Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the

Economic limit reached, when the plant cost exceeds the saving of steam
Both A & B
Practical limit reached, due to low heat transfer rate because of inadequate temperature difference
Neither A nor B

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